CN1016407B

CN1016407B - Method and apparatus deforming reformable tubular pipe liners

Info

Publication number: CN1016407B
Application number: CN 88104555
Authority: CN
Inventors: 帕特里克·R·莱顿克斯
Original assignee: Pipe Liners Inc
Current assignee: Pipe Liners Inc
Priority date: 1987-07-27
Filing date: 1988-07-26
Publication date: 1992-04-29
Also published as: EP0301697B1; CH679845A5; BR8803717A; DE3889992D1; AU1893888A; RU2039314C1; JP2728266B2; HK19695A; DE3889992T2; CN1031812A; AU610196B2; EP0301697A3; DE3889992T3; EP0301697A2; JPS6456531A; ES2054808T3; EG18534A; CA1312716C; ES2054808T5; EP0301697B2

Abstract

Method is provided for lining a pipe wherein a thermoplastic liner is initially formed in a cylindrical shape with a diameter slightly larger than the internal diameter of the pipe. The liner is temporarily deformed at an elevated temperature to a different cross-section, preferably U-shaped, to reduce its overall cross-sectional dimension to facilitate insertion into the pipe to be lined. Once inserted, the pipe liner is reheated to the crystallization temperature of the thermoplastic material to cause the liner to return to its original cylindrical shape. Pressure within the liner is also increased in two stages to cause the liner to conform to the interior surface of the pipe. An expansion pig may also be employed to ensure even more exact conformance. After expansion, ends of the liner which extend beyond the pipe are flared into engagement with the pipe flanges.

Description

Method and apparatus deforming reformable tubular pipe liners

When the present invention is presented in beginning or when repairing; relate to and in pipeline, use the thermoplastic inner lining with the unlikely corroding method of protection inner-walls of duct; for the pipeline that corrodes or damage, this kind liner can make the conveying capacity of pipeline inner fluid recover, and can stop pipe interior further to corrode.In No. 8107346, the French Patent (FRP) on April 13rd, 1981, narrated a kind of such lining of protection tube interior.

General objective of the present invention provides a kind of method of making the tubular products of deformation, and this tubular products serves as a contrast as disclosed pipe in the Laurene patent, and makes the pipe lining insert the interior apparatus and method of pipe.

Making the first step that this method of the tubular products of deformation relates to is, squeezes out the pipe lining with pipe cross-section, and second step was to make the pipe deformation of extruding, and the cross section reduces with as in the pipe lining insertion pipe.The characteristics of the method for this manufacturing tubular products are, use thermoplastic, and at the successive stages of moulding, during being squeezed into beginning shape and shape thereafter, when plastic material deformation and when in thermoplastic is packed pipe into, returning to the suitable condition of environment, the temperature of control thermoplastic.

An object of the present invention is to provide the method for the pipe lining of making continuous deformation section, and will manage lining and insert in the pipe, then make the bushing pipe in the pipe return to the method and apparatus that it begins the stressless cross section that squeezes out.In fact, the configuration of lining is the internal diameter that external diameter is equal to or slightly greater than the pipe of being protected, like this, and bushing pipe or stressless, or be in slightly circumference compressive state; These two kinds of conditions, any plastic lining that all pastes thereon as support structure by pipe around the handle is easily adapted to.

Another object of the present invention is under the condition that its structural intergrity is had no adverse effect, the tubular section that deformation begins to push, and with this kind mode, its tubular section that begins to push can also be recovered.For reaching this purpose, apply in check heat after its extruding, to set up the softening condition of thermoplastic, simultaneously, use warp tool on it to reduce its cross-sectional configuration.When reaching required dwindling, the cancellation heating twists in the fabricated product of continuous length on the spool then and deposits, carries and installation thereafter.

When showing and narrating the tubular configuration that the U type diminishes particularly, should understand, V-type and other cross-sectional configuration are no matter they are that H type or X type etc. all can use.Thinking that now U type or V-type are the most practical, is the configuration that this tubular products likes best usefulness.

Implementing when of the present invention, begin to squeeze out, the preferably distortion of pipe cylindraceous, be that the instrument with shaping carries out gradually.That is to say that the one side at least of tubular extrusion thing is depressed gradually and makes its laterally flat dwindling down become U type or V-type cross section with control tubulose extrudate; Thereby produce the pipe of a distortion.As above indication, this distortion is to carry out under the control heat of flowability in that thermoplastic is not had, like this, no matter be under its deformation condition, or under its primary condition that rebulids thereafter, the structural intergrity of plastics of distortion there is not adverse influence.Best is to make the tubular change that begins to push with roller.In fact, deformation is with many relative format rolls to combination little by little, carry out length by length.Therefore, characteristics are that utilization encases into the device of the relative format roll of rail, makes the tubular extrusion thing laterally flat following on copping rail.Then, the product that machines when pipe leaves the moulding rail and be cooled to environment temperature afterwards, when using cooling bath, cools off after breaking away from the moulding rail when without cooling bath.Heating and cooling are modes of utilizing heat absorption or radiation heating, preferably utilize the mode of the water-bath of temperature control or sprinkling to carry out.

At present, the business demand to this pipe lining is that diameter is 2 inches (50.8mm) product to 24 inches (609.6mm) scopes.Wall thickness will be according to the environmental requirement ratio in vary in diameter.Therefore, treatment step disclosed herein relates to multiple shaping jig, all can be different as format roll and backing roll, thus guarantee tubular extrudate one side distortion on demand at least.That is to say, depend on the size of being out of shape, wall thickness and material different, the number of shaping jig is different with the degree of progressively distortion.The feature of this method and device is, product is pulled out from extruder with controllable mode, and pulls out from warp tool, stores on the reel to deliver to, and like this, the cross-sectional configuration of deformation tubular products is exactly uniform, and is in the specific dimensional tolerance.Aspect the variation of size and tolerance, aspect the large diameter pipe lining, the objective of the invention is in the process of pipe deformation, on pipe, to apply pulling force, and pulling force is added on the warp tool disclosed herein especially, make it as dynamic roller.In fact, moment of torsion is to be applied to individually on moulding and the backing roll, therefore can guarantee to be out of shape the even advantage of tubular products.

Product disclosed herein is a thermoplastic pipe lining, it be by the reduced cross-sectional that begins to squeeze out, therefore, can be convenient to pull out and draw at pipe interior, return to the extruding cross section that it begins then.If the cross section of pipe is circular, the external diameter of the bushing pipe that begins to push and/or recover shaping is just identical or big slightly with the internal diameter of the pipe of accepting it.Like this, the outside of bushing pipe just forms good interface with tube interior and contacts, and preferably is in less circumference compression down.Bushing pipe in this pipe contacts with the interface of pipe, has eliminated any annular space between them, so, fill the requirement in this kind space and in fact just can avoid.The characteristics of this bushing pipe are the thin-walled configurations of bushing pipe, this bushing pipe is made by thermoplastic such as polyethylene, nylon, special fluorine human relations (polytetrafluoroethylene (PTFE)), acrylonitrile-butadiene-styrene terpolymer or other any such plastics, because thin-walled configuration, therefore, the small loss of flow channel internal diameter has been compensated by the excellent flowing coefficient in the bushing pipe of this thermoplastic manufacturing to a great extent.For the plan aspect of new pipeline, the common steel tube that expensive tubing such as stainless steel may be lined with this product lining replaces, and therefore, 1.5 to 2.2 times of escapable costs add and select best plastics, have improved the margin characteristic of convection cell.Because the pipe of this product lining can be installed and replacement by environmental requirement, so rational pipeline needn't be replaced on the structure.

The manufacturing method and apparatus of disclosed herein product pipe lining comprises the first step, squeezes out the thermoplasticity pipe, in second step, makes the deformation of thermoplasticity pipe.The first step of extruding relates generally to accept the extruder of material raw material and causes the tubular section by the vacuum tank of controlling processing temperature and the accurate configuration in tubular section.Make second step of tubular section deformation accurately, relate generally to the multistage shaping jig, it makes extrudate deformation under the temperature of control, and sending by cooling bath becomes final products pipe lining.The product pipe that is processed into lining is pulled out from second step with pulling out pull tool, pulls out the linear velocity that pull tool control is produced, and the wall thickness that the product pipe that is processed into is served as a contrast remains unchanged.

The present invention has also introduced improving one's methods and installing of the temporary transient pipe lining that is out of shape has been installed in pipeline, the pipe of deformation lining is expand into its original tubular, take another step to make pipe serve as a contrast even adapt to more exactly the interior shape of pipe again, two of expansion lining packs tightly itself and flange of pipe radially separately.

U type lining inserts before pipe or the pipeline section, and a plurality of preparation measures must be arranged.For example, by existing inlet, or by digging new inlet, pipe to be served as a contrast is entered after, the junction of pipe must break, the inside of pipe or pipeline section must be cleaned to remove all loose chip and/or deposits.Pull out then that backguy or leading line must pass pipeline so that U type pipe lining is drawn in pipe in downstream.In this respect.In whole specification, " upstream " is that the vial lining inserts the end in the pipe, and " downstream " is meant away from an end that inserts.In addition, reach following used " pipe " speech herein and refer to single section of a pipe, and a plurality of single hop pipe is in conjunction with pipeline that forms or pipeline section.In other words, " pipe " relate to any one or more snippets according to the present invention's pipe to be served as a contrast.And then, no matter the single hop number of tubes of wanting lining is how, in general, defining the pipe of the overall length of wanting lining or the openend of many pipes, the radial flange of all being furnished with routine is so that the connection of adjacent tubular segments.This flange also is used for installation method of the present invention and device, is explained as follows in more detail.

Brush for channel cleaning with the general design of a tool just can clean and the break-through operation.Simultaneously, also utilize cleaning brush leading line or pull out backguy and pass through pipe.Not only for the ease of cleaning operation, and, load onto a conduit at each end of pipe, an end opening of conduit by above-mentioned radial flange with such as the fixator of bolt etc. for the ease of the insertion and the expansion operation of pipe lining, enter in the pipe, the other end seals with the flange that can extract.The internal diameter of the conduit in the use is greater than the external diameter of bushing pipe, thereby removes conduit after expansion process easily.Same conduit size is also as one " duct cleaning platform ".Before upstream extremity was installed to pipe end to conduit, cleaning brush was introduced in the conduit, pulled out backguy or leading line and entered the interior opening of conduit, was connected to the tail end of cleaner.

One works as arbitrary end that conduit is connected to pipe, and just supply liquid or air behind cleaner move on the length of pipe to drive it.Simultaneously, the pressure-reducing valve of downstream conduit makes the air of cleaner front discharge from tube interior.The brush that is attached to the cleaner front portion is just with the known mode clean internal of person skilled in the art tube wall face.

When pipe-line cleaner with pull out backguy when arriving the downstream of pipe, the conduit in downstream is opened, and removes wiper.Pulling out backguy just links on downstream capstan winch or other the suitable wind.

At upstream extremity, upstream conduit is opened, leading line or pull out backguy and roll disconnects.Take out backguy by the conduit of opening then, link the guide end of U type bushing pipe.Afterwards, U type pipe lining just can pull down from its roll, carries out pipe through below capstan winch or other suitable wind.

Should be noted that, length according to pipe, cleaner was pushed away the pressure of pipe and the stretch-draw intensity of backguy, may need the rapid process of multistep to make final backguy pass pipe, for example, for 2 miles (3.2 kilometers) even a longer long section pipe, or the place of leakage arranged in the pipe, the pressure that harvests in the pipe may be not enough to promote cleaner, simultaneously, also is not enough to the backguy of desirable strength or cable are pulled through pipe.In this case, beginning is just passed pipe to a low weight what is called " setline " with low weight cleaner, then with one or more lines of little by little strengthening, is pulled through with increasing cleaner, is pulled through pipe up to final backguy or cable.

One works as bushing pipe draws in the pipe through the below capstan winch, just it is cut into suitable length, makes each end of pipe all stretch out one section short bushing pipe, and promptly the length of bushing pipe approximately is that this height of pipeline section adds that the conduit of each end on trip and the downstream is long.Then, in conduit, put packer/dilator device and make the sealing of bushing pipe end, make bushing pipe begin to expand with mechanical mode.Afterwards, fluid, preferably the hot liquid of closed steam generator system is by a compactor/dilator device supply, and enter pipe so that bushing pipe is heated on the raw material crystalline temperature once more, for example, when using the polyethylene raw material of Union Carbide Corporation, be heated to 260 °F (127 ℃).In heating period once more, partially open with respect to the outlet valve of the conduit of the other end of the conduit of supply hot liquid, so that hot liquid flows out, up to reaching required temperature.In case reach on the raw material crystallization temperature, just think that it has recovered its initial cylindrical shape.Simultaneously, the pressure in the bushing pipe rises, and is preferably in first pressurized segment and rises to about 7 crust (7.14 atmospheric pressure).

Yet frequent situation is that the total length of whole pipe all is not round especially everywhere, therefore, as not more not additional measures, just annular space or other hole may occur between bushing pipe and inner tubal wall.

According to the present invention, regulate outlet valve so that the pressure in the bushing pipe is increased to about 15 crust (15.3 atmospheric pressure) at second section, make the more accurate inner surface configuration that is adapted to pipe of bushing pipe.Know that all the applying of second section pressure is considered to choose wantonly, depends on the situation of the pipe that is served as a contrast and the wall thickness of bushing pipe.

Then,, after the valve discharge of conduit, remove compactor/dilator device, then, when bushing pipe is still warm, the wiper of a calibration is introduced the top conduit, and pass pipe at hot liquid such as water.And the circumference of bushing pipe imposed outside radial load with remaining air between extrusion bushing pipe and the pipe, thus guarantee and inner tubal wall, comprise that weldment is further consistent with other surface imperfection place.This second go-devil drives with cold water and passes pipe, and cold water can " freeze bushing pipe " to the fixed position.

Finish in case the bushing pipe in the pipe expands, remove the conduit of upstream and downstream, and heat the bushing pipe end once more, magnify, below will more be described in detail to contacting with the blind flange of pipe.

Utilize the present invention, diameter is 2 to 24 inches (50.8-609.6 millimeters), and 2 miles (3.2 kilometers) or longer pipeline can be equipped with continuous pipe lining, thereby provides desirable corrosion protection for new pipeline and existing corrosion pipeline.

Other advantage of the present invention comprises:

1. protected the architectural feature of the pipe of dress lining again, and may from 3.5 to 18 millimeters according to the thickness range of designing requirement U type lining hall.The internal diameter that minimum reduces is compensated by the unusual flow coefficient of thermoplasticity lining.

2. aspect the plan of new pipe,, can use U type bushing pipe to exempt the needs of expensive material such as stainless steel or alloy for transporting the deep-etching product.In most applications, flowing in the plastic liner will be more effective than using stainless steel or compo pipe.

3. to the corrodible pipe lining in inside, can make the pipeline of new pipeline and reparation that arranged longer service life, need not to spend many money to come whole section ground to change the pipeline of corrosion and damage.This will reduce the downtime of repairing and keeping effectively, thereby reduce production costs greatly.

4. because U type lining pipe inserts very long section of a pipe, this method has been simplified in the environment sensitive district or has been passed urban population and difficulty that the traffic area of concentration often runs into and suffer the perturbed problem of the land for roads of more oppositions.

5. though the general useful life period of plastic lining, can reach 100 years, the also damage that can occur not expecting, owing to U type bushing pipe is convenient to remove and change, and also relatively more cheap, thereby in repairing economically.Insert thermoplasticity U type bushing pipe and will make the pipe that has corroded return to original flow behavior, and reduce the further wearing and tearing and the corrosion and damage of steel pipe walls, therefore, the economic life of the facility that extended widely.

Process simple, fast, to save cost, downtime short.

In the embodiment of selecting, the pipe lining is to make with high density polyethylene (HDPE) (HDPE), and it can be DGDB-2480 black 4865 compounds of Union Carbide Corporation, satisfies the requirement of American Standard of Testing Materials 1248-81a about polyethylene 34 class C products.It is characterised in that anti-high-caliber environmental stress breaks and high strength is arranged.Nylon, special fluorine human relations TM, acrylonitrile-butadiene-styrene terpolymer or other any such plastics also can utilize.

The high density polyethylene (HDPE) of selecting tests with the 280 number of chemical product that expection can be flow through pipeline, reported relevant high density polyethylene (HDPE) already pointed out, especially the following observed result relevant with the present invention:

(a) anti-H ₂S, CO ₂Performance height with NaCl;

(b) carry the performance of gas fabulous;

(c) can be in crosslinked ground treatment product under the high temperature (250 (121 ℃));

(d) stable when aging;

(e) roughness value is low reaches 0.020;

(f) do not hold stay the precipitation or deposit;

To recognize from above-mentioned, utilize heating to discharge the stress in the bushing pipe and recover and be frozen into its original barrel shape so that machine the back bushing pipe, yet, promptly pressing another aspect of the present invention finds, if the pressure in the pipe maintains one section preset time to discharge stress, so, the release of this stress need not increase temperature and also can obtain, and guarantees that bushing pipe will be usually supports with its tubular and lean against on the original tube inner wall.Of the present invention open to the fluid that bears pressure usually promptly the rebush once more of the pipeline of gas or liquid is a particular importance, and wherein, the fluid pressure that transported of rebush pipeline is enough to make bushing pipe usually to remain on tubular again.

According to this aspect of the present invention, a bushing pipe when distortion is configured in the pipe, and the opposite end of bushing pipe is out of shape on the conduit of every end, as preceding narration, need not heat pipe, in pipe, insert pipe-line cleaner, bushing pipe is reverted to general tubular configuration by mechanical mode.For realizing this purpose, go-devil preferably is inserted in the downstream (though it can be inserted in upstream extremity) of pipe, introduces the fluid of pressurization in the back of go-devil, or gas or liquid, and gas preferably is as air.The upstream extremity that is preferably in pipe provides back pressure.For example, can make pressurized with fluid behind the wiper to about 25 to 150 pounds/inch ²(1.75-10.5 atmospheric pressure), and the upstream extremity of pipe can be pressurized to about 5 to 40 pounds/inch ²(0.35-2.8 atmospheric pressure).When wiper was advanced by bushing pipe, it reverted to the original cylindric of it to bushing pipe.When wiper was advanced end, bushing pipe was kept one section preset time, for example about 30 minutes interior depressing.Release pressure is all removed wiper and conduit then, enlarges two opposite ends of bushing pipe, and all these steps all by previous described carrying out, import again by the fluid that is used to pressurize.Particularly, this kind transports effect can or be lower than recovery once more in 24 hours in about 24 hours quite short of the time cycle, and like this, pressurize once more by the pressure of working solution in the inside of bushing pipe, thereby keep bushing pipe usually to support the inwall place that leans against pipe with tubular.As a result, pressure will guarantee that bushing pipe is adapted to existing pipe, and after a while, all stress have also just discharged so that even when operating pressure is removed bushing pipe will remain cylindric basically.

Recognize that if bushing pipe is kept one section preset time under pressure, the aforementioned method of capstan lining of giving can be applicable to non-pressurised pipe.For example, keep-up pressure, can guarantee that in most of the cases bushing pipe restores, and keep its original cylindric configuration in the time in 3 to 4 weeks.For the shorter time, for example, be lower than the time in 1 week, bushing pipe can not restore and keep the tubular configuration of its best.Yet in the short like this time, effective stress has discharged, and it is on the drum substantially that bushing pipe remains on.Restore and keep its ability of original tubular configuration and the diameter of bushing pipe, material is relevant with wall thickness.Therefore, diameter and/or thickness are big more, and bushing pipe should remain under the pressure so that restore and to remain on the time used on its original tubular configuration long more, otherwise too.

The invention of this paper narration can be applied to the pipe of many types, comprises water pipe, the mud ascending pipe; Oil and natural gas pipeline; Steam and smog pipe; Brine Pipe; Public utilities sewage and drainpipe; Discharge and dispensing pipe etc.

The specific embodiments of selecting according to the present invention provides a kind of method of producing the plastic pipe liner of distortion, the external diameter that tubular section of its pipe lining has can with pipeline in match, then insert in the pipeline, be recovered to former cross section then.Improved method is characterised in that, at first, folding in deformable portion, make the tubular section flat down, method is, along the left-right symmetry face, but the deformation part is radially pressed to the part of a relative side, near the plane of symmetry, the opposed side portions of tubular section is become the double-walled configuration, make burst and place the opposite side of tubular section; Second step, the relatively double-walled configuration bending of both sides again, thus the opposite side that makes the double-walled configuration advances towards bilateral symmetry plane is laterally flat again, this does not elongate with regard to having reduced cross section, so that in the insertion pipeline, and return to initial cylindrical shape again, matching with pipeline.

The selected specific embodiments according to the present invention, a kind of equipment also further is provided, the plastic deformation pipe lining that has the tubular section in order to production, so that be inserted in the pipeline subsequently, and then return to the cross section that squeezes out, so that match with the internal diameter of pipeline, the characteristics of improved equipment are, has a rotatable backing roll that is positioned on the trunnion axis at least, this trunnion axis is parallel and relative with at least one rotating format roll, backing roll has the outer rim of individual groove shape, groove is centered close in the left-right symmetry face, so that can match with the support section of tubular section, format roll with projection, in the left-right symmetry face, begin to fold, and be folded to form circumference, so that but the deformation of tubular section part is radially depressed towards support section along bilateral symmetry plane, the tubular section becomes with respect to the part bending fold of symmetrical plane both sides folding double-walled configuration, thereby be juxtaposed on the relative support section of tubular section, the rotatable format roll of a pair of landscape configuration, lay respectively on the vertical axis of the relative both sides of bilateral symmetry plane, each all has curved convex circumference, so that cooperate the both sides of the pipe section of double-walled configuration, and by folding the double-walled configuration of relative both sides, and further they laterally inwardly are pressed into towards symmetrical plane, therefore the section configuration of tubular section is reduced, and it is relative both sides are gone into by the center accurately at top is further flat again, thereby consistent with bilateral symmetry plane.

The embodiment of another selection of the present invention provides the method that a hollow tubular thermoplasticity bushing pipe is installed in pipe, being characterized as of this method, reduce sectional dimension by the shape that changes the bushing pipe cross section, wherein, under the shape memory activation temperature of about 160-180 (71-82 ℃), altered bushing pipe is moved in the pipe, make tubular liner stretch out the opposite end of pipe, heat bushing pipe once more to the memory activationary temperature, so that bushing pipe returns to the size and dimension of cylindrical cross-section, then, increase the interior pressure of bushing pipe so that bushing pipe is suitable for the interior shape of pipe.

The embodiment of another selection of the present invention provides internal diameter and external diameter, basically be the method for in the pipe of circle a thermoplasticity bushing pipe being installed, the method is characterized in that, formation has tubular when heating up for the first time, its external diameter is greater than the thermoplasticity bushing pipe of the internal diameter of pipe, the temporary tubular bushing pipe that makes is out of shape to change cross-sectional configuration when heating up for the second time, this configuration has reduced bushing pipe sectional dimension about 25%, make bushing pipe be cooled to environment temperature, bushing pipe is inserted in the pipe, bushing pipe is heated to is at least the temperature that heats up for the second time, so that bushing pipe returns to tubular, again bushing pipe is applied the expansive force that adds, bushing pipe is fitted with pipe in fact.

The present invention also has the embodiment of a selection that the method that the thermoplasticity bushing pipe is installed in pipe is provided, the step that this method comprises is, provide one to form by thermoplastic, it generally is the bushing pipe of hollow tubular, the cross sectional shape that changes bushing pipe is to reduce sectional dimension, altered bushing pipe is disposed in this pipe, make bushing pipe stretch out the opposite end of pipe, make bushing pipe return to its general cylindrical cross-section with mechanical system, and support against tube inner wall, one section preset time in inside of bushing pipe from out to out pressurizes, so that bushing pipe leans against on the tube inner wall, discharge and trend towards making bushing pipe to restore in the bushing pipe getting back to the stress of its altered shape.

Other purpose and the advantage of invention will be found out from as detailed below.

Fig. 1 is a sketch, and the process of producing for the plastic pipe liner of the extruding of the extruding cross-sectional configuration that returns to beginning is described;

Fig. 2 a, 2b, 2c, 2d and 2e are the sectional drawings that the pipe of extruding serves as a contrast a series of deformation stages, and are shown as the tubular configuration that protruding pipe is carried on the back with the part Section line, so that the comparison of deformation in each figure;

Fig. 3 is the skiagraph of the deformation apparatus of an amplification, and this deformation apparatus is carried out method of the present invention, makes the thermoplasticity pipe distortion that squeezes out;

Fig. 4 is the detailed sectional drawing that amplifies to Fig. 9, be basically among Fig. 3 by 4-4,5-5,6-6,7-7, the sectional drawing that 8-8 and 9-9 line cut;

Figure 10 is the side view of signal, shows guide wire is pulled through the pipe of wanting lining according to the present invention;

Figure 11 is the side view of a signal, and another step in the pipe lining process is described, wherein, rough line is pulled through the pipeline section of wanting lining;

Figure 12 is the top view of a signal, illustrates according to the present invention, and the pipe lining of a temporary transient distortion just is being pulled through pipeline section;

Figure 13 is a pipeline section and the sectional view of relevant pipe lining;

Figure 14 is the sectional view of temporary transient converting pipe lining according to the invention;

Figure 15 is the perspective view of a part, illustrates that the bushing pipe of temporary transient distortion is positioned among the pipeline section of wanting lining;

Figure 16 is a schematic diagram side view, and the beginning according to pipe lining expansion process of the present invention is described;

Figure 17 is the side view of the used compactor of the present invention/expander combination;

Figure 18 is the part side view of device shown in Figure 17;

Figure 19 is the side view of a signal, and the pipe lining of opening according to complete expansion of the present invention is described;

A schematically progress is represented in Figure 20～22, and the forming process according to the present invention's radial flange on a pipe lining has been described;

Figure 23 is a top view sectional drawing, and expansion tool according to the invention is described;

Figure 24 is the side view of the tool component used of the expansion tool shown in Figure 23;

Figure 25 is the end-view of lined duct of the present invention;

Figure 26 is the side view of a signal, a plurality of alignings that have an independent pipe lining of the present invention have been described pipeline section.

Now, with reference to the accompanying drawings, the present invention introduces the method for coming new pipeline of liner and old pipeline with the pipe of a distortion, and the pipe of distortion is drawn in the pipeline, and distortion makes it to combine closely with pipeline then.The distortion pipe can be flat down by any energy, returns to any suitable material of pipe original section then, for example plastics manufacturing.In fact, pipe lining is the thin-walled plastic sleeve pipe of the continuous length that squeezes out, then its is inserted in pipeline with as internal protection; For example protect new pipeline, and the pipeline of repairing corrosion again.

Therefore, begin to push pipe disclosed in this invention lining L, the internal diameter with the pipe that will insert is the same big at least to make it the external diameter that had, preferably surpasses this caliber slightly, so that when it was operating position in pipeline, tubular bulb lining L was under the slighter circumference compressive state.Characteristics of the present invention are that tubular bulb lining L distortion is convenient to store with the cross-sectional configuration that reduces it, and is convenient to insert pipeline.That is to say that the original tubular cross section of pipe lining L is flat down, and then recovers, whole process is not destroyed its dimensional characteristic.Therefore, the circular in configuration of pipe lining L is not stretched, even the material that uses is plastics, and bears distortion.In other words, under the condition of deformation, the pipe lining L that begins to push has kept the characteristic in its original tubular cross section, and deformation condition can insert in the pipeline it, and then returns to its original cylindrical cross-section.Feature of the present invention is that the thermoplastic pipe lining L that begins to push is not had the ground of elongation afterwards and produces deformation by moulding.Thereby and necessary dimensional characteristic when having kept its to recover.

Refer now to the deformation of the pipe lining L shown in Fig. 2 a to 2e, the configuration that begins to squeeze out is cylindraceous, has inner diameter wall 10 and outside diameter wall 11.The deformable portion 13 that a upper support part 12 and a bottom are arranged as shown.Deformation is symmetrical, and around the vertical plane a of symmetry configuration, utilizes crooked and folding instrument to make pipe flat down around this plane.Therefore, formed relative

lateral parts

14 and 15 by center fold 16, but and upwards reversing and with the internal diameter 10 of support section 12 and put of the part 13 that fold 16 makes bottom deformation.Therefore, each lateral parts all comprises the sidewall that hangs from tubular top mid-point, and curves inwardly so that make progress until center fold 16.Obviously, two lateral parts 14 just become the double-walled configuration with 15 under flat, this configuration towards the direction of the central plane a of symmetry inwardly advance one one flat down, as clear demonstration the among Fig. 2 e, this is desired product configuration.

With reference now to Fig. 1 of accompanying drawing,, use method explanation pipe formation of summarizing and the method for being out of shape as shown in the figure, an extruder appts E is arranged, then be a cooling device C1, it is delivered to pipe in the deformation apparatus D of execution product deformation process.Behind the deformation process, product is sent through cooling device C2, so that it is finalized the design at ambient temperature, and deliver on storage spool S or other similar devices by pulling out the equipment P of drawing, extruder E is this area equipment commonly used, and it accepts plastic raw materials, and utilizes firing equipment 18 to be heated to for example 350 ° to 440 °F (177-227 ℃), under this temperature, force plastics to pass through extrusion die 17.Cooling device C1 also is this area equipment commonly used, the vacuum cooling equipment of being supported by vacuum cooled unit 19 preferably, and it is reduced to the temperature of pipe, for example 260 °F (127 ℃).Deformation apparatus D is subjected to the control of a thermal control equipment, so that it is maintained on the necessary deformation temperature for example 260 (127 ℃).Cooling device C2 also is this area equipment commonly used, and it makes the temperature of pipe drop to environment temperature, and for example available cooling tower 20 of this temperature or other cooling device are kept.During cooling, the shape of the bushing pipe of distortion will be kept, and reaches environment temperature up to pipe.This shape can be with external pressure such as roller, and chain rail or belt are kept, or keep by interior vacuum.Equipment C1 and C2 comprise water-circulating pump, know, above-mentioned temperature can change by environment requirement.Pulling out and drawing equipment also is this area equipment commonly used, and the distortion that will shape tubular products under the device of front, leave behind, its force pulling is in check, so that cast does not stretch or compresses in its deformation process, thereby controls its wall thickness.

Now, the method or the process of having a talk and making continuously extruded plastic pipe deformation, the sequence of steps that comprises is as follows: at first, the tubular cast pushes by analysing and observe shown in the figure line of Fig. 2 a to 2e, thereby sets up uniform wall portion, preferably tubular configuration.The top semi-circular portion, promptly support section 12, and is supported, and fold 16 is aimed at Center Symmetry Plane, is extruded in the bottom of cast mid point (bottom dead centre), and gradually upwards with the inwall 10 of the pipe of top mid point and put.Know that the process of deformation can be in any angle, allly finish at the bottom mid point as described above, but also can be from its side, top or any other angle are finished.In this deformation process, relative

lateral parts

14 and 15 inwardly rotates and/or bending in their lower

terminal end

21 and 22, so that wall upwards continuity in their inwalls 10 separately reaches fold 16(and sees Fig. 2 a to 2d).

At the bottom mid point cast that curves inwardly, make it just constitute fold 16 down along the center plane of symmetry is flat.Simultaneously, utilize this flat down,

lateral parts

14 and 15 lower

terminal end

21 and 22 also curve inwardly by above-mentioned.In the practice, pipe is flat preferably to be undertaken by several steps down so that little by little consistent with the change configuration of cast, and does not make its cross-sectional configuration elongation.Yet, can know that described so far flat also available one-step method is down finished, for example in the minute diameter pipe.Yet as shown in the figure, the process under flat had four steps along the symmetrical centre bobbin here, the support that each step all lean on top 12, distortion be bottom 13.

The first step under flat shown in Fig. 2 a, by bending, the formation of beginning fold 16, and beginning curved lower terminal 21 and 22.Three step Fig. 2 b, 2c subsequently and 2d are little by little and constantly crooked, and fold 16 moved make it to locate near inwall 10 at the top of cast mid point (top dead-centre), simultaneously, constantly and little by little be bent upwards and mobile lower

terminal end

21 and 22, as shown in the figure.Thus, the cross sectional configurations of tubular section reduces.

Present Fig. 2 e of accompanying drawing, towards the central plane of symmetry curve inwardly that relative

lateral parts

14 and 15 finishes final step flat down, to reduce the arc configuration of these two lateral parts, make these two parts all be in the radius or external diameter of initial cast, so that be in fully in the internal diameter of the pipeline that pipe lining L finally will insert, the feature in last flat following this step is, make two lower

terminal end

21 and 22 and place on the symmetrical centre plane, best, they are nearer near arriving fold 16 knees than the continuous tube wall in top.

Referring to the sectional drawing of Fig. 3 and Fig. 4 to 9 then, this relates to be used to make the preferred form of the device of continuously extruded plastic pipe type distortion.Can see that five folding steps of finishing are thus arranged, four steps are that upwards little by little to divide for 13, the five steps be laterally inwardly folding in the bottom of folding pipe along the central plane of symmetry.Each step in five steps all relates to BENDING PROCESS, even be not fully, also is stretching, extension or the elongation of having avoided managing the cross section of the tube wall that serves as a contrast L basically.Each folding step is all used forming tool, and preferably format roll R1, R2, R3 and R4 then with format roll S1 and S2, finish.Be exactly that these rollers little by little make the cast of extruding folding.In fact, format roll R1～R4 is minimum, also has backing roll B1, B2 and B3 to support cast when cast is subjected to roller R1～R4 and upwards pushes.As shown in the figure, roller R～R4 and B1～B3 are on the transverse axis that horizontal parallel at interval disposes.

Backing roll B1 is configured in format roll R1 and goes up (see figure 4), it is characterized in that recessed bobbin shape 25 is arranged on Center Symmetry Plane, and matches with the support section that is essentially semicircle 12 of cast.Backing roll B1 has the side flanges of two relative expansions, surrounds the

cast lateral parts

14 and 15 that begins to form.

Format roll R1(sees Fig. 4) feature be on Center Symmetry Plane, to be useful on the folding periphery 27 of the projection that begins and be shaped, upwards to push cast at the bottom mid point.Format roll R1 has two relative concave flanks flanges 28, and the beginning of its control

lateral parts

14 and 15 lower

terminal end

21 and 22

forms.Roller flange

26 and 28 periphery are very approaching, so that stop the cast between the two.

Backing roll B2 is configured on format roll R2 and the R3, and in the two middle (see figure 3), its feature is the recessed bobbin shape of Center Symmetry Plane 35, and matches with the support section that is essentially semicircle 12 of cast.Backing roll B2 has two relative expansion flanges 36, and the degree of expansion is less than the B1 roller, with the formation of control cast

lateral parts

14 and 15.

Format roll R2(sees Fig. 5) be characterised in that it is a convex folding forming periphery 37 in Center Symmetry Plane, with the moulding tube wall that further makes progress along this symmetrical plane.Format roll R2 has two relative concave flanks flanges 38, and its controls the lower

terminal end

21 and 22 of lateral parts 14 and 15.The flange 36 of roller and 38 circumference separate slightly, and surround the cast between them.

Format roll R3(sees Fig. 6) be characterised in that it has convex folding and forming periphery 47 in Center Symmetry Plane, with further along this symmetrical plane cast that upwards is shaped.Format roll R3 has two relative spills and surveys flange 48, and recessed degree is less than roller R2, and its controls the lower

terminal end

21 and 22 of lateral parts 14 and 15.

Roller flange

36 and 48 circumference are separated by slightly, to surround cast therebetween.

Backing roll B3(sees Fig. 7) be configured on the format roll R4, it is characterized in that, its recessed bobbin shape 55 on Center Symmetry Plane, with cast be that semicircular support section 12 matches basically.Backing roll B3 has minimum side flanges 56, and it surrounds the

lateral parts

14 and 15 of cast.

Format roll R4(sees Fig. 7) be characterised in that its most sharp-pointed protrusion folding and forming periphery 57 on Center Symmetry Plane, so that further along this symmetrical plane moulding tube wall.Format roll R4 has relative concave flanks flange 58, and its recessed degree is lower than roller R3, and it surrounds the lower

terminal end

21 and 22 of lateral parts 14 and 15.Roller flange 56 and 58 peripheral closely related so that stop and guide therebetween cast.

The 5th and last folding step realize that by the format roll S1 and the S2 of a pair of located lateral this pair roller is configured in the relative both sides (seeing Fig. 8 and 9) that cast has just left format roll R4 place.Roller S1 and S2 reduce the arc section of the support section 12 of pipe, as shown in the figure.Therefore, roller S1 is configured on the parallel vertical pivot of being separated by with S2, it is characterized in that the curve configuration 60 of recessed drum, and each roller is positive center from the top, i.e. small radii from the full radius of the beginning of cast to lower

terminal end

21 and 22, the flexibility of its curved configuration increases.Roller S1 and S2 have top and base flange 61 and 62, and flange is along periphery and put so that fully stop the final wrinkle and the cast of deformation, thereby, make product pipe lining L.

According to the present invention, clearly demonstrate as accompanying drawing 8 and 9, the cast of pipe lining L is folded on the rail R that is disposed between format roll S1 and the S2 at last.The cross-sectional configuration of rail R and

lateral parts

14 and 15 and the inwall of lower

terminal end

21 and 22 match.Therefore, as figure clearly represents, established the final cross-sectional configuration of pipe lining L.In fact, rail R and cast are sliding-contact, are extending longitudinally substantially, thus can reduce temperature, and under the condition that remains in required cross-sectional configuration, harden.What pay special attention to is, the cross section of the hourglass shape of rail R is suitable for the folding of above-mentioned lower

terminal end

21 and 22, makes they and the approaching degree of Center Symmetry Plane, than more approaching between the knee of fold 16 and the top inner wall.In the practicality, rail R optionally depends on limited shape.Bending 16 accurately if desired, rail R will help to keep this kind shape.For example, this rail R is necessary to the welding (bud fusion) of distortion pipe.

Can see that from aforementioned the moulding of pipe is (the seeing Fig. 3 and 9) that progressively carries out, from Fig. 1 as seen, relate to temperature control, and the material of selecting for use be thermoplastic.Therefore, as clearly demonstrating among Fig. 3 of accompanying drawing, there are several water injection nozzles 70 to scatter and regulate water, so that temperature remains on for example 210 °F (99 ℃), thereby make plastics softening, and guarantee its flexural property.Also can introduce other thermal source such as hot-air or radiant heat, to obtain the required temperature of pipe, this temperature will surpass the crystalline temperature of raw material.Nozzle 70 spreads to hot water the scope of format roll R1 to R4 and S1 and S2.Therefore, cast becomes plastic, so that by moulding with become required distortion situation.The pipe moulding, and after being slidingly connected on rail R, scattering low temperature by water injection nozzle 71 and regulate water, can make the forming temperature of plastic tube drop to environment temperature, causing the pipe lining L after the processing to be cooled to for example 70 °F (21 ℃), all processes are all as Fig. 1 of accompanying drawing and shown in Figure 3.As shown in Figure 3, adjusting water collects with groove or pond 72 and is used for circulation shown in Figure 1.Cooling device C2 enters cast and drops to environment temperature when transmitting in transmission or from rail R.

Shown in Figure 3 as accompanying drawing, roller B1-B3, R1-R4 and S1 and S2 freely rotate on bearing 73, so cast can move forward by described device.Yet, when processing thin-walled large diameter pipe serves as a contrast L, just need some material to help cast and move.Therefore, the torque mechanism M of the torque motor type of electronic or hydraulic can provide required help (see figure 4).Know that shown in institute's drawings attached, axle 74 has all installed antifriction bearing 73.

Also will understand from aforementioned, its cross-sectional configuration of made tubular bulb lining L reduces to return to pipe then and serve as a contrast the cross-sectional configuration that begins to squeeze out, like this so that inserts in the pipeline, it just is fixed in the pipeline that is designed rightly, and all processes are undertaken by different environmental requirements.

In order to make bushing pipe L insert pipeline, and recover its original configuration, refer now to 10-26 with the aid of pictures, there is shown the barrel 80 of the pipe of wanting lining.The shape of pipe is that each end all has

radial flange

82,84, so that can link to each other with adjacent pipeline section with usual mode.

The process of lining conduits mainly illustrates with the sketch form, therefrom can understand, and pipe can be on the ground, and the scene is underground or carry out lining under water.In any case above-mentioned, need disconnect pipeline in the entrance of selecting, vertically be separated by, if also need pipeline to flow continuously, then on the place, two ends of the part that is served as a contrast receives by-passing part between the pipeline section.This bypass or joining method do not constitute a part of the present invention, need not be further described at this.

Before the operation of beginning bushing pipe, should check the ability of applied pressure when pipe stands the lining operation with definite pipe.Certainly, if damaged tubular, reasons such as corrosion reach the degree that can not bear this kind pressure, and so, problematic pipe parts must be replaced and lining not.

The inside of pipe 80 can be with conventional pigging brush 86 cleanings, and the wiper brush radially stretches into and contacts with tube wall and passes pipe interior, to remove bulk materials, residue, deposit effectively and the lining process to be had other material of negative influence.One works as the upstream extremity that wiper 86 is introduced into pipe 80, and upstream and downstream conduit 88 is connected with flange of

pipe

82,84 respectively with 90.For ease of this connection, conduit have the flange 82 of termination ', 84 ', aim at the hole (Figure 25) on the respective flanges, finish connection with bolt or other suitable securing member.

From spool 94 through the passage 96 of conduit 88 and penetrate pull out backguy or leading line 92, before upstream conduit 88 closures, link to each other with the tail end of wiper 86.

Upstream conduit 88 with closing end 98 comprises the plate that can extract, has settled an inlet valve 100 on the plate.When the beginning pigging operation, valve 100 communicates with forced air or fluid supply 104 through conduit 102.Downstream conduit 90 also has an end plate, has settled a pressure-reducing valve 106 above.The pressure that Pressure gauge 108 monitoring pipe are interior.

Forced air or water are followed in the back of wiper 86 through valve 100 and are entered in the pipe, consequently promote the pigging brush and advance, and haul line 92 by pipe arrival downstream.In this pigging operating period, the pressure setting of pressure-reducing valve 106 is at about 100 pounds/inch ², (7 atmospheric pressure) is to guarantee when wiper moves to the downstream of pipe pipe suitably being outgased.When wiper 86 arrives downstream, and when moving into conduit 90, discharge the internal pressure of pipe gradually,

open conduit

88 and 90, remove wiper 86.Afterwards, backguy 92 just can be extracted out, then, it is fixed on relevant capstan winch or the spool 110, as shown in figure 11.

Further referring again to Figure 11, shown pipeline section 80 has the conduit 88 and 90 in its distal openings, has the light weight lead-in wire 92 that begins usefulness that links to each other with rough line or leading line 112.With near the capstan winch 110 the downstream that is positioned at pipeline 80 and conduit 90 line 92 and 112 is pulled through pipeline 80.Unclamp guide wire 112 from the spool 114 of pipeline upstream extremity.As pointing out already, have only when the pipeline of wanting lining is very long, or owing to for example leak, make wiper 86 and relevant setline or pull out backguy when pushing away piping, the guide wire of reinforcement or pull out backguy gradually just so can not hold sufficient pressure in existing pipeline inner product.One pulls out through pipeline 80 when suitable rough line, just can near cut-out upstream conduit 88, and afterwards, the U type that is connected on temporary transient distortion serves as a contrast on the L, and clearer explanation is shown in Figure 12.Pulling out the suitable clamping device that backguy represents with 116 place's illustration on Figure 12 is connected on the U type bushing pipe L.Best, clamping device 116 is radially expanded type, prevents that with activation the end of bushing pipe from damaging.Also illustrated as Figure 12, U type bushing pipe L can unclamp from placing storage axle or supply spool S near the upstream conduit.Also will recognize, rely on the diameter of the pipe lining L of original extruding, lining pipe temporarily is out of shape in factory, load and transport in the mode that is wrapped in continuously on the spool then, at the caliber of original extruding greatly to can not carry out predeformation and load and transport the time, a light anamorphic attachment for cinemascope is provided, is out of shape bushing pipe L on the spot with the operation of one-time continuous at the scene, and be pulled through the pipe that will serve as a contrast.The device that discloses among the principle that light anamorphic attachment for cinemascope constitutes and the present invention is identical, exception be that before distortion, heater will make the pipe temperature of present environment be elevated to crystalline temperature above it.In other words, the advantage of the pipe of pre-warm (vacuum tank of extruder is outer) is unavailable to the use of the instrument of light distortion.

What Figure 13 represented is the sectional view of the bushing pipe L of pipe 80 and last expanded form.Show among it and Figure 14 that the sectional view that pipe lining L is in the U type of temporary transient distortion forms contrast.Figure 15 is a perspective view, shows that the U type lining L of temporary transient distortion is pulled through the pipe situation after 80s of wanting lining.See Figure 16 now again, will be noted that, beginning, bushing pipe L approximately reaches the openend of

conduit

88 and 90, this not only convenient process that expands, and leave sufficiently long bushing pipe and form radial flange, the narration in more detail below of used mode.

In Figure 16, schematically represented the situation that pipe 80 internal lining pipe L begin to expand.One works as bushing pipe correctly locatees, and just each end from upstream and downstream conduit 88,90 inserts compressing/extension fixture of machinery in bushing pipe.Compress/extension fixture 120,122 all is identical in all fields, therefore, only needs to describe in detail to a kind of.Know in Figure 16-18 and see that downstream filling/extension fixture 122 comprises an ingress pipe or conduit 124, it can be connected in closed boiler 126 uses, and by it, hot liquid enters bushing pipe through valve 128.Fluid temperature is monitored with conventional thermo detector 130, and conventional Pressure gauge 132 monitorings of the pressure in the bushing pipe.Inlet tube 124 is through pipe elongated portion 124 ' be connected in tubular hold down gag 134, and hold down gag is made up of the sealing ring of routine, and the size of sealing ring is to seal up the bushing pipe that links to each other with conduit 90, thereby prevents that the liquid in the bushing pipe from escaping by conduit.The tubular wedge expander 136 that has conical surface 138 stretches out forward from hold down gag, is used to force the bushing pipe end to turn back to tubular, sees as clear in Figure 16.Also there is similar device at 88 places in upstream conduit, and bushing pipe L is mechanically expanded earlier at two ends by above-mentioned mode.Endoporus 140(Figure 17 and 18 is arranged on the expander 136), it and entry conductor 124 and the work that links to each other of sealing boiler 126.Therefore will see that expander 136 not only starts the process of expansion, is convenient to hot liquid simultaneously and enters into bushing pipe L through via hole 140.

One when compactor/dilator device 120,122 is positioned in the

conduit

88,90 respectively, make flange 142 stick corresponding flange on the

conduit

88,90, at this moment, hot water is incorporated into the inside of bushing pipe from thermal source 126.Because system seals, hot water can be raised to high temperature and not produce steam, and in this incipient stage, hot water is introduced bushing pipe so that the temperature of bushing pipe is raised on its crystalline temperature.Raise the stage in temperature, the pressure-reducing valve 144 of compactor/dilator device 120 allows to make the hot water Continuous Flow cross bushing pipe under the pressure of about 7 crust (7.14 atmospheric pressure) of phase I.Recognize, under first pressure, make bushing pipe be heated to its required time length of shape memory temperature once more, depend on the diameter and the length of the pipe of wanting lining.

In case bushing pipe has been heated to 160 °F (71 ℃), the memory of the U type of bushing pipe is eliminated, and bushing pipe trends towards presenting its original barrel shape.Yet as mentioned previously, because the inwall of pipe 80 can not be very round, tubular bushing pipe L just can not be in full accord with inner surface of tube that may warpage, especially under the situation of the distance of overlength.Therefore, the pressure in the bushing pipe is raised to about 15 crust (15.3 atmospheric pressure) at second section, so that bushing pipe L is expanded to is fully consistent with the inner surface of pipe 80 basically, as shown in figure 19.Conduit in the process has also disposed air outlet slit (air bleed ports), and it can make the air or the liquid that capture between bushing pipe and the original pipe escape.The conduit Another reason bigger slightly why that Here it is than the external diameter of bushing pipe.

Afterwards, valve-off 128 disconnects thermal water source 126, the hot water in the evacuated tube.Take out compactor/dilator device 120,122 then.Another characteristics of the present invention are, when bushing pipe is still heat, in the routine expansion wiper inlet tube 80 that diameter is identical with the internal diameter of the bushing pipe of expanding substantially, it was pushed away pipe, bushing pipe is applied radial pressure, with remaining air between extruding pipe and bushing pipe, thereby the liner surface 100% and the inner surface of pipe are fitted.The wiper cold water of handy supply drives, and more or less the plastics of wiper back are frozen into final shape, the institute of eliminating between bushing pipe and the pipe has living space.

We have narrated the process of expansion stage according to heating fluid is introduced through compactor/dilator device 122 from the source 126 in the downstream of pipe 80, recognize that source 126 also can link to each other with upstream device 120 and work.Given this,

conduit

88,90 and install 120,122 comprises that conduit 124 all has conditioning equipment, the inlet of necessity of pressure-reducing valve etc., and outlet is so that they are actually interchangeable.

Figure 20 to 22 more now, it has illustrated the bushing pipe end concise and to the point step of expansion process gradually.Therefore, Figure 22 represents that conduit 88 dismantled, and bushing pipe L stretches out the situation of pipe 80.Generally, bushing pipe will cut off according to the predetermined data with calculating of the required bushing pipe length of the intended size radial flange that the various diameter pipes of foundation generation are used.One works as bushing pipe has cut, and begins for first expansionary phase, for example, with an air gun bushing pipe is heated to about 180-200 °F (82-93 ℃), and flange 148 is being about 50 to 70 ° ground, angle lower part formation with level, as shown in figure 21.This specific angle will depend on various factors, such as the diameter of pipe, flange length or the like.One when the enlarging that forms beginning at the bushing pipe end, and the bushing pipe end cools off fast, and then is heated to about 180-200 °F (82-93 ℃).In second expansionary phase, partly the further deformation in Kuo Zhang end is to combine with flange of pipe 82 and to form radial flange 148, and as shown in figure 22, afterwards, bushing pipe is cooled once more apace.

Figure 23 is one and carries out the expansion tool example that above-mentioned first and second expansionary phases use.Manual screw jack 150 is at least two fixed-site, and is best, round flange 82, at a distance of 188 °.Therefore, the bolt 152 of a pair of heavy load passes the bolt hole that forms in flange 82 and the cross bar 154.Cross bar 154 has screwed hole 156, so that insert the very heavy head part 158 of screw thread, very heavy head part 158 is equipped with flaring tool 160 between two-end-point, hold down gag 162 is installed, packing ring 164 nuts 166 and handle 168 at the another side of cross bar.Handle 168 clockwise rotations will make flaring tool 160 enter the bushing pipe end, thereby utilize compactor device 162 to wriggle in pipe 80 in enlarging operating period to stop bushing pipe L by the same way as enlarging of before being narrated in the first enlarging stage.After finishing first section enlarging, from very heavy head part 158 removing tools 160, and change second section flaring tool 170 into, as shown in figure 24.This second section instrument be a column piece with holes only, and it flattens to combine fully with Pipe Flange 82 enlarging of part.In this respect, in end-view, Figure 25 represents bushing pipe L last configuration that enlarges and expand in pipe 80.

Further get in touch, recognize with first and second flared section, the inevitable and caliber of the speed that flaring tool combines with the bushing pipe one or both ends, temperature etc. are relevant, damage to prevent one or both ends.Therefore, before arriving predetermined numeral by conventional means monitor temperature, flaring tool is not pasting the bushing pipe one or both ends.In addition, in the enlarging stage, during each cooling stage, instrument maintains under the total pressure and combines with bushing pipe.

To recognize further that also screw jack 150 can be hydraulically powered, especially for big-inch pipe particularly like this.

In Figure 26, shown a plurality of adjacent pipes 80, each pipe all has a bushing pipe L who adds according to the said process subsides.The radial flange 148 that forms on every liner section causes interior lining continuous, and does not have pipe to be exposed to flow through the material of pipeline.Certainly, also have by a plurality of single pipeline sections and introduce the another kind of scheme of a continuous bushing pipe, and similarly effective result is also arranged.

For those pipes of generally on pressure, working, find, if bushing pipe maintains the interval of the next prolongation of pressurization, be heated to crystalline temperature with regard to the unnecessary bushing pipe that makes, after bushing pipe deformation, freeze to such an extent that make it maintain the tubular of beginning again.According to the present invention, the sort of pressure can comprise the fluid pressure in the pipe when in operate as normal.Thereby the inside of the pipe that will serve as a contrast is with after conventional pigging brush 86 cleanings, and conduit 88 and 90 is settled and put in place, and the bushing pipe of distortion inserts in the pipe, and lining pipe utilizes wiper and applied pressure to return to its original tubular by mechanical mode.So in this specific embodiments, the end of conduit begins distortion by previous narration, be preferably in downstream and insert wiper.Wiper can be conventional, can comprise the foam of an intermediate density.When wiper begins to insert, the tube end sealing, the fluid of pressurization, for example air is introduced after the pipe close of downstream, and fluid pressure is about 25 to 150 pounds/inch ²Between (1.75-10.5 atmospheric pressure), depend on pipe sizes and length.In addition, the upstream extremity at pipe provides for example about 5 to 40 pounds/inch ²The back pressure of (0.35-2.8 atmospheric pressure) or vacuum are pressed, and also depend on the length and the size of pipe.Because different pressure is added on the wiper, wiper just advances to upstream extremity from the downstream of pipe, when it is mobile between two ends, just makes pipe return to its original tubular configuration with mechanical mode.When arriving upstream extremity, the pressure in the length of whole pipe in wiper back and bushing pipe is kept general preset time, for example about 30 minutes.Make the bushing pipe decompression then, and remove conduit and wiper simultaneously.Then, enlarge the bushing pipe two ends, as discussed previously, make fluid operating once more.

Have now found that, if pipeline is started working once more behind the lining, for example exerted pressure to bushing pipe inside from the working solution that flows through bushing pipe in about 24 hours at preset time, after bushing pipe is depressurized, this kind pressure will be guaranteed the tube wall applying of bushing pipe and existing pipe especially.Find that also after a while, for example in about 3 or 4 weeks, the stress in the bushing pipe is released, bushing pipe will usually be a tubular, even also is like this when the working solution of pressurization is removed thereafter.Therefore, aforesaid lining process can be used for usually not being in the pipeline pressure under, and condition is, the pressure in the bushing pipe will be kept preset time, and is that to discharge the interior stress of the bushing pipe that tends to make bushing pipe be deflected into its original deformed shape needed during this period of time.The time that needs and diameter, wall thickness and the material of bushing pipe and required circularity are relevant.For example, if allow the bushing pipe in the pipe to expand into non-tubular configuration, so, the time cycle that bushing pipe is under the pressure just can be less than 1 week.On the other hand, tubular bushing pipe completely if desired, the so this time cycle must be 3-4 week.So, if after machinery recovered shape, the pressure in the pipe can be kept preset time, so, as previously discussed, just needn't discharge stress with high-temp liquid.Therefore, this technology is useful especially to the lining of the pipe that transports pressure fluid usually.

The present invention narrates in conjunction with being thought of as most realistic and best embodiment at present, but know, the present invention is not limited to disclosed embodiment, but opposite, and the intent of the present invention is essence and various improvement projects in the scope and equal arrangement that comprises claims.

Claims

1, on-the-spot a kind of method that the thermoplasticity bushing pipe is installed in the pipeline of horizontal-extending, cylindrical cross-section comprises the steps:

A) provide the thermoplastic hollow bushing pipe of extension, it has the cross sectional shape of change; Under the shape memory activation temperature, substantially quite treat the cylindrical cross-section of bushing pipe road internal diameter from its external diameter, change to and can make it enter the cross sectional shape that having of pipeline reduces, described bushing pipe has predetermined wall thickness;

B) described distortion bushing pipe is inserted pipeline, make its both ends stretch out two opposite ends of this pipeline;

C) by inserting the mechanical device of described bushing pipe end, the bushing pipe end of pipeline opposite end is stretched out in demi-inflation, and the bushing pipe end that makes expansion is near the original cylindrical cross-section shape of shape;

D) this expandable liners end of pipeline opposite end is stretched out in sealing, thereby seals this bushing pipe inside in its opposite end;

(e) after the sealing bushing pipe, and keep its sealing state, then, make bushing pipe roughly fit to inner-walls of duct, and keep its predetermined originally wall thickness, this be by:

(1) hot fluid is injected this bushing pipe,

(2) by this hot fluid the bushing pipe inboard is forced into first predetermined pressure that is higher than atmosphere,

(3) by hot fluid to the conduction of the heat of bushing pipe, bushing pipe is heated once more, to a predetermined temperature, thereby make bushing pipe roughly return to the cylindrical cross-section of its memory,

(f) afterwards, make the pressure in the bushing pipe rise to second predetermined pressure that is higher than first predetermined pressure, bushing pipe accurately fitted on the inner-walls of duct surface,

(g) also be in when hot when bushing pipe, introduce cooling fluid and flow through bushing pipe, so that make bushing pipe finally fixedly form the form that meets inner surface of pipeline.

2, according to the method for claim 1, it is characterized in that, e set by step in an expansion end of bushing pipe by described mechanical device), (1) heated fluid injection.

According to the method for claim 1, it is characterized in that 3, described sealing step comprises the sealing between two expandable liners ends and this mechanical device.

4, according to the method for claim 3, it is characterized in that, e set by step in an expansion end of bushing pipe by described mechanical device), (1), heated fluid injection.

According to the method for claim 1, it is characterized in that 5, described thermoplastic is the high-density polyethylene ene compound.

6, according to the method for claim 1, it is characterized in that, before step b), comprise the step of cleanser conduit inside, afterwards, introduce a backguy, and bushing pipe is pulled through pipeline to the pipeline upstream extremity.

7, according to the method for claim 5, it is characterized in that, comprise changing the bushing pipe cross section to-U-shaped cross section step.

8, according to the method for claim 1, it is characterized in that, described thermoplastic comprises a kind of high-density polyethylene ene compound, and comprise the steps: in step a), bushing pipe to be changed into U-shaped cross section, e set by step by its original cylindrical cross-section), (1) by described mechanical device at an expansion end of bushing pipe heated fluid injection, before step b), cleanser conduit inside, afterwards, introduce a backguy, and bushing pipe is pulled through pipeline to the pipeline upstream extremity.